Not much you can do other than rest and get lots of vitamins. I always indulge in Gatorade, "arctic blast" flavor in particular, when I'm really sick.
The real interesting development in medicine recently IMO is improved blood tests - I think the traditional use of blood tests (once in a blue moon when something is wrong) is crazy, it's a huge opportunity to fine-tune one's health by getting high quality blood tests a few times a year.
Even just psychologically - having that "I'm taking care of my health" feeling from a few blood tests a year is great to reduce health anxiety
That's a great point about blood tests. I've been seeing some interesting stuff about measuring all kinds of things to know exactly where you're body is at and what types of foods you can increase to get things just as they should be.